Specifications
  209
Glossary
work with it. Usually used to mean 
the specific system and tools you are 
working with right now.
MAC layer The Medium Access 
Control layer is one of two layers that 
make up the Data Link Layer of the 
OSI Reference Model. The MAC layer 
is responsible for moving data 
packets to and from one Network 
Intercafe Card (NIC) to another 
across a shared channel.
machine Some logic analyzers allow 
you to set up two measurements at 
the same time. Each measurement is 
handled by a different machine. This 
is represented in the Workspace 
window by two icons, differentiated 
by a 1 and a 2 in the upper right-hand 
corner of the icon. Logic analyzer 
resources such as pods and trigger 
terms cannot be shared by the 
machines.
markers Markers are the green and 
yellow lines in the display that are 
labeled x, o, G1, and G2. Use them to 
measure time intervals or sample 
intervals. Markers are assigned to 
patterns in order to find patterns or 
track sequences of states in the data. 
The x and o markers are local to the 
immediate display, while G1 and G2 
are global between time correlated 
displays.
master card In a module, the 
master card controls the data 
acquisition or output. The logic 
analysis system references the 
module by the slot in which the 
master card is plugged. For example, 
a 5-card Agilent Technologies 16555D 
would be referred to as Slot C: 
machine because the master card is 
in slot C of the mainframe. The other 
cards of the module are called 
expansion cards.
menu bar The menu bar is located 
at the top of all windows. Use it to 
select File operations, tool or system 
Options, and tool or system level 
Help.
message bar The message bar 
displays mouse button functions for 
the window area or field directly 
beneath the mouse cursor. Use the 
mouse and message bar together to 
prompt yourself to functions and 
shortcuts.
module/probe interconnect cable 
The module/probe interconnect cable 
connects an E5901B emulation 
module to an E5900B emulation 
probe. It provides power and a serial 
connection. A LAN connection is also 
required to use the emulation probe.
module An instrument that uses a 










